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E. J. w. RAGSDAEE ET AL BRAKING MECHANISM FOR STEERING WHEELS Feb. 12; 1929.

Filed April 5, 1924 5 Sheets-Sheet 1 INVENTOR.

u A e A. HAEDEIPER.

TI EARL JIM Boqsmus AND G 'Frji A TTORNE Y.

Feb. 12, 1929. I 1,701,862 E. J. w. RAGSDALE ET AL BRAKING MECHANISM FOR STEERING WHEELS Filed April 5, 1924 Y 5 Sheets-5M6 2 N 5 7 11 w o I a? a 50 49 W! o I j 55 fife! 54 I N 80 40 H .fix v o 7 I 47 Q z .60

I J7 5, 38 48 1? \I 9 lg 5 0 9 1a I w o I I I Q 0 a1 M I 1e 0 O O 9 II o r O 1 I\ I z INVENTOR.

BKLIMEAJOALE Nzrzvsss 4N0 HnEDEREEI ATTORNEY.

E. J. W. RAGSDALE ET AL BRAKING MECHANISM FOR STEERING WHEELS Feb. 12, 1929.

5 Sheath-Sheet Filed April 5, 1924 IN VEN TOR.

A TTORNE Y.

,wo Gus A E A. B)-

Feb. 12, 1929. 1,701,862

E. J. W. RAGSDALE ET AL BRAKING MECHANISM FOR STEERING WHEELS Filed Apr iI 5, 1924 5 Sheets-Sheet 4 IN VEN TOR.

54 m. Jh/Ewswus 171m 51- r A.

Nnwsssz- BY Feb. 12, 1929.

E. J. w. RAGSDALE ET AL BRAKING MECHANISM FOR STEERING WHEELS Filed April 1924 5 Sheets-Sheet INVENTOR. 491. 1 N B4 50: A/vo Gus-m rs A. HHEDEPER.

5r ATTORNEY.

Hnmrssk Patented Feb. 12, 1929.

UNITED. STATES l,7fl1,862

PATENT OFFICE.

EARL J. w. RAGSDALE, on Nonnrs'rowN, AND GUSTAVE A. HAEDERER, or PHILA- DELPHIA, PENNSYLVANIA. AssIGNons'ro BUDD WHEEL COMPANY, OF PHILA- DELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

. BRAKING MECHANISM FOR STEERING: WHEELS.

Application filed April 3, 1924. Serial No. 703,999.

Our invention relates to improvements in braking mechanism for. steering wheels.

The chief object of our invention is to pro vi de a braking mechanism, for the tront or steering wheels of motor vehicles, which is substantially housed within the wheel so that it not'in position tobe subjected to the mud and dirt thrown or splashed up by the wheel as it rolls along the road.

It also an object of our invention to pro vide a braking'mechanism for a front wheel, which swivels around a substantially verticalqaxis, in which the braking mechanism arranged in line with this axis and also substantially in the "ertical plane through the mint of contact of the wheel with the acter above stated which may be housed sub stantially within the wheel so that it is protected from dirt or mud thrown up or splashed by the wheel and to provide operating connections for such a braking mech anism which are not affected by the swiveling movement of the wheel about its vertical It is an object of our invention to provide a front. wheel braking mechanism in which thepartial application of the brakes causes the continued rotation of the wheel to auto-- matically increase the braking effect, so that the wheel. is quickly brought to rest, and in which this braking mechanism is of such chlractm that it may be substantially housed within the wheel, in line with the vertical axis around which the wheel swivels, and lysulstantially in the vertical plane "through the point. of contact of the wheel with the ground. 7

or object of our invention to nple but adequate means for actunt wheel bral-zes.

simple means s, which adjusting ther object of our invention is means are such that they are readily accessible so that adjustment may be made without removing the brake drum or dust cover.

Further objects, and objects relating to details and economies of construction and operation, will definitely. appear from the detailed description to follow. In one instance, we accomplish the objects of our invention by the devices and means described in the following specification. Our invention is clearly defined and pointed out in the appended claims. A structure constituting a preferred embodiment of our invention is illustrated in the accompanying drawing, forming a part of this specification, in which Fig. 1. is a vertical, sectional view through a front wheel mounted on one end of a front axle of a motor vehicle, showing our improved braking mechanism applied thereto. H

i Fig. 2 is a sectional viewtaken on the line 2-2 of Fig. 1, the dust cover being removed.

Fig. 3 is a detail, sectional view of the lever-operating cap, taken on the line 3-3 of Fig. 2. i

Fig. 4 is a detail, sectional view taken on the line 44 of Fig. 2 and showing the fulcrum of the toggle-actuating lever.

Fig. 5 is a detail, sectional. view, taken on the line 5-5 of Fig. 2, showing the connection between the toggle-actuating lever and the toggle linkage.

Fig. 6 is a detail, sectional view, taken on the line 6--6 of Fig. 2 and showing a guide means for the brake band.

Fig. 7 is a detail, sectional view, taken on the line 7--7 of Fig. 3 and showing the brake adjusting means.

Fig. 8 is a view showing the toggle and lever in the brake-applying position.

Fig. 9 is a vertical, sectional view showing our improved brake mechanism applied to a different type ot front axle, and

Fig. 10 a view taken on the line 11- -11 of Fig. 9 with the dust cover removed.

In the drawings, the same reference numerals refer to the'same parts throughout the severalviews and the sectional. views are taken looking in the direction of the arrows at the-our s ofthc section lines.

in general, we accomplish the objects of our in. ention by providing a brake-actuating mechanism which cooperates with a brake drum secured to the wheel hub and is vertical axis.-

so located that the brake shoes co-act with the brake drum substantially in line with the vertical; axis on which the wheel hub vis sw'ii' e ledr ,VVe find it very desirable, also,

that the brakes should co-act with'th'e brake drum substantially in line with the vertical plane through the point of contact of they wheel with the ground, as this provides a construction in which the stresses on the parts are reduced to a minimum and in which the braking mechanism is effectively protected and shielded from the water, mud

or dust thrown up or splashed upby the wheel as it rolls along the ground. e find it desirable to provideabraking mechanism which is actuated by. a vertically-movable thrust cap located in line with the vertical axis about'whichthe wheel swivels.- Be- I causeof this location of the thrust cap, the

ment with such brake drum by suitable mechanism actuated, for instance, by the vertically movable thrust cap referred to. We propose to provide suitable anchor members arranged in position to be engaged byparts of the brake band so that, when the brake band begins to grip the brake drum, the continued rotation of the wheel brings a part of the brake bandinto engage- 'ment with these anchor member-sand tends to force the brake band into still more effective braking engagement with the brake drum.

We propose. toprovide toggle linkage conneeting the free ends of the brake band and operated by a lever which is actuated by the verticallyemovable thrust cap. We. also propose to provide resilient means which normally retain a part of the brake band in engagement with these anchor members.

The purpose of this is to prevent unnecessary noise whenthe brakes are applied. We propose. to actuate the vertically-movable thrust- .cap by providing it with an internal screw thread meshing with acorrespondlng vertical-axis of the kingpin so that this rotatlon, due to the screw thread above mentioned, Wlll cause vertical movement of the thread formed on a stationary part in linewith. the kingpin upon which the hub ofthe wheelis swiveled. We propose to provide a suitable operating arm by means of which this thrust, cap may be rotated, around the cave recesses formed in the wheeldisc.

found to work very satisfactorily. Referring to the numbered parts of the drawings in which this braking mechanism is illustrated, the a2;le,,10, in the form illustrated in Fig. 1, has its outer end forked, at 11.

A hub support, 12, is mounted upon the substantially vertical trunnions, 13' and 1%, carried by the forked end of the axle, so as to swivel around the substantially vertical axis defined by'the said trunnions. The lower portion of the hub support,.12, is enlarged, at 15, and provided with a recess, 16,

which receives the lower fork" arm, 11, of the axle. The hub, 19, of the wheel, has a horizontally extended spindle which is journaled within the hub, support, 12, by

means of the taperedroller bearings, 17 and 18, sons to rotate around a substantially horizontal axis. The wheelhub is retained in placeby means of the nut, 21, screwed on wheel, 23, is secured by means of the convex nuts, 24, screwed on the studs, 25, projecting from the hub flange and engaging in" cop; it, is to be noted that the demountable wheel, 23, comprises aconcave disc which is fastened to the hubflangeto one side of the vertical plane through the point of contact of the wheel tread with the ground, so that the end of the axle and the braking mechanism are both housed within and protected by the wheel. p

v A brake drum, 28, is secured to the flange of the hub, 19, by means of nuts, 30, screwed on the studs, 25. The periphery 7 of the drum may be provided with fins, 29, to facilitate the cooling of the drum, if desired.

,A brake band, 26, comprising a split-ring having a lining, 27, of braking material applied to the exterior thereof, coope ates with the inner surface of the brake drum, 28. A dust cover, 31, secured to the hub support, 12, by means of the stud bolts, 32, closes the open side of the brake drum, as shown in Figs. 1 and'lO. This dust cover may have a peripheral flange, 83, overlying the periphery of the brake drum. The series of angle brackets, 34, are secured to'the dust cover, 3 1,by means of the screws, 35, (Fig. 6) and these brackets have slots,

36, formed thereinthrough which e'vtend the lugs, 37, secured to the brake band, 26'

This arrangement provides a guide for the brake band and a floating sup ort therefor which permits a limited movement of the brake band with reference to the hub support. 12. and the dust cover. 31.

The free ends of the brake band are connected by a toggle linkage consisting of the links. 38 and 39, which are pivotally connected by the pin, 40. The opposite end of the link, 38, is pivoted, at 41, to a bracket, 42, seemed to the corresponding end of the brake band, 26, said bracket having a shoulder. 43, for engagement with the anchor plates hereinafter to be described. Similarly, the opposite end of the link. 39, is pivot-ally connected, at 44, to a bracket, 45, secured to the corresponding end of the brake band, 26, and having a shoulder, 46, for engagement with the said anchor plates. The anchor plates, 47, two in number, are secured to the hub support, 12, by means of the bolts, 48, said anchor plates being spaced from each other, as shown in Fig. The anchor plates, 47, have the radially extending fingers, 85 and 86, one of said fingers beingadapted to engage one of the shoulders, 43 or 46, upon the application of the brakes. I A lever, 49, w0rks between the anchor plates, 47, and is pivotally mounted on said plates by means ofthe bolt, 50, as shown in Figs. 2 and 4. The bolt, 50, also extends through a spacing nut, 81, and may extend also through the dust cover, 31, and have nut, 82. securcdthereonto assist in retaining the dust coverin place. One end of the lever, 49, is pivotally connected, at. 52, to a link, 51, the opposite end of said link being pivotally connected to the toggle linkage by means of the pivot pin, 40, as shown in Fig. 5. The opposite end of the lever,:-i .-.9,is providcd with an operating head, 58, for en gagement with the head, 54, of an actuating cap, 60, mounted. in line with the vertical axis around which the wheel swivels. This 'arm of the lever, 49, also hasan extension,

55. One end of a spring, 56, is connected to this extension, 55, and the other end of said spring is connected, at 58, to a bracket, 57,

secured to one of the brackets, 34, carried by sleeve, 61, of bearingmetal, provided withscrcw threads corresponding to those on the amt, 62 ot the trunnion. A aassa 'e 59 may be provided through the head, 54, to'

permit the lubrication. An adjusting plate, 64, has a split sleeve, 65, which embraces the lower portion of the cap, 60, being clamped thereon by means of the bolt, 66. This adjusting plate has a serrated surface, 67, provided with an arcuate slot, 68, therein. An actuating arm. 69, has a boss, 7 0, at one end, which is freely mounted upon the cap, 60. The lower surface of the arm, 69, is also serrated so as to cooperate with the serrated surface, 67, of the adjusting plate, and a screw threaded stud, 71, on the actuating arm, 69, projects ,throughthe slot, 68, of the adjusting plate. This provides for the ready adjustment of the actuating arm with respect to the cap, 60, and the arm may be clamped in adjusted position by means of the nut, 72, on the lower end of the stud, 71. This provides for a ready adjustment of the brake mechanism, which may be made without removing the dust cover. The end, 7 3, of the actuating arm may be connected to any suitable mechanism for moving said arm so as to rotate the actuating cap, 60.

A series of springs, 74, 7'5, 7 6 and 80, are provided for retracting the brake band and withdrawing it from engagement with the brake drum. 'llhesesprings are connected to the lugs, 37, onv the brake band, and to the hub support, 12. A spring, 77, is connected at one end to a pin, 78, car-riedby the link, 51, and the opposite end of said spring is connected to a pin, 79, carried by the anchor plates. 47. This spring tends to hold the shoulder, 43, on the brake band bracket, 42, in engagement with the fingers, 85, of the anchor plates, 47.

In Figs. 10 and 11 we have shown our invention applied to a diilerent type of axle. In this modified form, the axle, 90, carries a substantially vertical king pin, 91. A spindle member, 92, is forked and has its upper arm, 94, and its lower arm, 93, swiveled upon the upper and lower ends, respectively, of the king pin, 91. This spindle member carries a tapered spindle, 95, upon which the wheel hub, 96, is journaled bymeans of suitable roller bearings The dust cover, 3l, secured to this spindle member, 92, as SllOWIl in Fig. 10. The hub support or spindle member, 92, is, in this instance, provided with the integral portions, 47, having the fingers, 85 and 86, which are the full equivalent of the anchor plates, 47, heretofore described.

The upper end of the king pin, 91, has an externally screw threaded portion, 68', and the thrust cap, 60, has cast therein a bearing sleeve, 61, having internal screw threads fitting this screw threaded portion of the king pin. A wear plate, 54, closes the upper end of the thrust cap, and is provided with a central passage, 59, therethrough, through which lubricant may be injected for lubricating these screw threads.

no I

The kingpin may also be provided with a lubricating passage, 59, so that lubricating tion of this brake mechanism a very simple proposition; The otherparts of the brake mechanism, shown in Figs. and 11, are

substantially the same as those illustrated in the other figures of the drawing and, hence, theirdescription will not be repeated here.

From the description of the parts given above, the operation of this mechanism should be very readily understood. It will be observed that the brake band, 27, is a floating brake member inasmuch as it is not positively connected either to the drum. or the hub support, but is permitted to have alimited circumferential movement with respect to the drum. This brake mechanism is housed within the convex disc, 23, of the demountable wheel, and the mechanism is so arranged that the wheel contacts with the ground in line with the vertical axis around which the wheel swivels, and the brake band also engages, the brake drum substantially in line with said axis. Due to the way in which the braking action is lined up, the side stresses and strains are reduced to a minimum with the result that strains upon the axle construction are materially lessened. It is also important to note that the braking mechanism is housed within the wheel .sothat it is protected to a great eX-, tent from the mud,- slush and dirt, which 'may. be thrown up by the wheel as it rolls cap and the trunnion upon which it is mounted, the thrust cap moves vertically V upward. Sinceone end of the lever, 49, engages this thrust'cap, this vertical move,

ted a limited circumferential ment will rock the lever, 49, on Its pivot,

50, and straighten out the toggle linkage composed of the links, 38 and 39, forcing. the free ends of the brake band, 27, away band, engages one or the other of the abutbe'en described.

n1ent s,'85 and 86, on the anchor plates, 47, the latter being carried by and fastened. to the hub support. As soon as one of. these brackets engages the corresponding abu ment, the further movement of the brake ment of this end of the brake band. The

frictional engagement of the remainin por tion of the brake bandfwith the brakedrum will cause it to wrap around thebrake drum and to expand intotighter gripping engagement therewith. The spring, 77, tends to holdth'e brake band in sucli aposition that the shoulder, 43,. is normally in engagement with the abutment, 85, and, since the arrow indicates the direction of forward rotation of the Wheel, this prevents. any click or objectionable noise caused by the shoulder coming into'con-tact with the corresponding abutment when the brakes are applied while the vehicle s moving forward;

The spring, 56, normally holds the head,

53,; of the lever, 49, in engagement with the thrust cap, 60. The lubrication of the parts is permit-ted through the passages, 59, in r the end of the thrust cap, as has already be adjusted Very convenientlyby means of the member, 64, having the slot, 68, in which the pin, 71, upon the operating arm, moves.

We are aware that the embodiment of our invention, which has been illustrated -in the accompanying drawings, is suscep ible of considerable variation without departing from the splrit of our invention,

The brake mechanism may i and, therefore, we desire to claim our invention broadly, as indicated by the appended claims, r

Having thus described our invention, what We claim as new'and useful and desire to secure by Letters Patent is v 1. The combination of an-axle, a hub support swiveled at the end of said axle around a substantially vertical axis, a; hub journaled on said hub support, a wheel carried by said hub and contacting with the ground i in line with the verticalaxis around which the hub support swivels, abrake drum carried by SttlClllHlZ), a brake member mounted.

for bodily movement circumferentially of 'the drumand adapted to engage sa d drum in line with saidvertical aXis,:an abutment fixed With. respect to said brake meinbeiz,

means for actuating said brake member, and means comprising the contact of a portion of said brake member with said abutment whereby continued rotation of the wheel, after said brake member engages the drum, automaticaliy increases the braking pressure exerted by said member.

2. The con'ibination of an axle, a hub support swiveled at the end of said axle around a substantially vertical axis, a hub journaled on said hub support to rotate around a substantially horizontal axis, a deinountable wheel detachably secured to said hub and coi'itacting with the ground in line with said vertical axis, a brake drum carried by said hub and housed within the wheel, a brake member mounted for bodily movement circumferentially of the drum adapted to engage said drum in line with said vertical axis, an abutment fixed with respect to said brake member, means for actuating said brake member, and means comprising the contact of a portion of said brake member with said abutment, whereby continued rotation of the wheel, after said brake member engages the drum, automatically increases the braking pressure exerted by said member.

3. The combination oi an axle, a hub support swiveled at the end of said axle around i a substantially vertical axis, a hub journaled on said hub support torotate around a substantially horizontal axis, a wheel carried by said hub, a brake drum carried by said hub, a brake band having means thereon atfording a limited circumferential movement thereto with respect to said drum, means for actuating said brake band, an abutment fixed with respect tothe hub support and adapted to be engaged by a partoi said brake band, and means for holding a part of said brake band in contact with said abutment.

4, The combination of an axle, a hub support swiveled at the end of said axle around a substantially vertical axis, a hub journaled on said hub support to rotate around a substantially horizontal axis, a wheel carried by said hub, a brake drum carried by said hub, a brake band having means thereon affording a limited circumferential movement thereto with respect to said drum, means for expanding said band into bra-king engagement with said drum, an abutment fixed with respect'to said hub support and adapted to be engaged by a part of said brake band, and spring means for holding a part of said brake band in contact with. said abutment.

5. The combination of an axle, a hub supported swiveled at the end of said axle around a substantially vertical axis, a hub journaled on said hub support to rotate around a substantially horizontal axis, a

wheel carried by said hub, a brake drum carried by said hub, a brake band having means thereon affording a limited circumferential movement thereto with respect to said drum, means for expanding said band, and abutments engaged by portions near the end of said band upon frictional movement of the band in either direction from normal position, and means normally holding a portion of said band in contact with one oi said abutments. V

6. The combination of an axle, a hub support swiveled at the end of said axle around a substantially vertical axis, a hub journaled on said hub support to rotate around a substantially horizontal axis, a wheel carried by'said hub, a brake drum carried by said hub, a brake band mounted to have a limited circumferential movement with respect to said drum, means for expanding said band into engagement with the drum, abutments fixed with respect to the hub support and adapted to be engaged'by portions near the end of said band upon circumferential movementot the band in either direction from normal position, and spring means normally holding the band in a position such that it engages only one of said abutments.

7. The combination of an axle, a substantially vertical trunnion carried by said axle, a wheel swiveled on said trunnion, a brake drum moving with the wheel, a brake band co-acting with said drum, a toggle linkage interposed between the free ends of said brake band, a thrust cap movable vertically on said trunnion, means for moving said cap, and lever connections between said cap and toggle linkage, said toggle linkage, thrust cap and lever connections being disposed in substantially the same vertical plane.

8. The combination of an axle, a substan tially vertical trunnion carried by said axle,

a wheel swiveled on said trunnion, a brake drum moving with the wheel, a brake band co-aoting with said drum, a toggle linkage interposed between the free ends of said brake band, a thrust cap movable vertically on said trunnion, a lever engaging said thrust cap and connected to said toggle linkage, said toggle linkage, thrust oap and lever connections being disposed in substantially the same vertical plane, and means for moving said cap.

9. The combination of an axle, a substantially vertical trunnion carried by said axle, a wheel swiveled on said trunnion, a brake drum moving with the wheel, a brake band co-acting with said drum, a toggle linkage interposed between the free ends of said brake band, a thrust cap movable vertically on said trunnion, a lever engaging said thrust cap, a link connecting one end of said lever and the toggle linkage, said toggle linkage, thrust cap and lever connections being disposed in substantially the same vertical plane, and means for moving said cap.

10. The combination of an axle, a substantiall'y vertical trunnion carried by said axle,

a wheel swiveled on saidtrunnion, a, brake drum moving with'thewheel, a brake band co-acting with said drum, a thrust cap movable Vertically on said trunnion, a toggle gaging said'thrust cap, a link Connecting th'e opposite end of said lever and the toggle linkage, aspring connected to the end of said lever which engages the thrust cap, and means for moving said thrust cap.

' 11. The combinationoi an axle, a hub support swiveledat the end of said axle around a substantially vertical axis, a heel journaled on said hub support to rotate around a substantially horizontal axis, a brake drum moving with, said wheel, a brake band co-actingwith' said drum, a toggle linkage interposed between the free ends of said band, an anchor'jplate carried by said hub support and having portions constituting abutmentsadapted to be engaged by portions of the brake band,'athrust cap movable Vei'tically'in line with" the vertical axis on which the'wheehswivels, a lever fulcrunie'd on said anchor plate and having one 'end engagin -said thrust cap and the opposite end'connected to'saidtoggle linkage, and meansfor ino'ving saidthrust cap.

-12. Thecombination' of an'axle,'a substantially vertical trunnion carried byfsaid axle and having a screw threaded portion, a wheel swivele'd 'on said trunnion, a brake drum movingwith'said wheel,'*a brake band coauztintg with's'aid drum,'a togglelinkage I interposed "between the I freeends of said a brake band, a thrust ca mountecl on said trunnion for movement'radiallywithrespect vto said brakeband, said'thrust cap having internal "screw threads fitting the screw threaded portion "of the trunnion, lever having one end engaging said thrust cap and the opposite'end connected to said'toggle linkage, and means for rotating'said thrt'i'st' cap. I

13. 'The combination of an axle, a'su'bstantially vertical trunnion carried by'said axle and having a screw threaded "portion, a wheel swiveled on said trunni'oma' brake drummovingwith said wheel, a brake band co-acting with said drumga toggle linkage interposed between the freeen'ds 01 said brake band, a thrust 'cap mounted on said trunnion and having'internal screwthreads fitting the screw threaded portion 'of the trunnion, a lever having oneendengaging said thrust cap and the opposite end 0011-" nected to said toggle linkage, a spring connected to the end of'said' lever wliiohiengages the thrust cap, and means for rotating said thrust cap. I i

i 14. The combination of anaxle, asubstantially vertical trunnion carried" by said axle andhaving a screw threadedportion, a wheel swiveled on said trunnion, "a brake drum moving'with saidwheel, a brake band coacting with said drum, a toggle linkageintel-posed between theiree ends of said brake band, a thrust cap mounted on said trunnion for movement radially with respect to said brakeband, said thrust cap havinginternal screw, threads fitting the screW threaded portion of the trunnion, a lever having one .end engaging said'thrust cap, a 7

link connecting the opposite end of'said lever and the toggle'linka'ge, and means for rotating said thrust cap.

15. The combinationof an axle, a substantially verticaltrunnion carried by said axle and having. a screw threaded portion, a; hub support swiveled on said trunnion, a wheel journa-led on said hub support to rotate about a substantially horizontal axis, a brake drum moving with said Wheel, a brake band having meansthereon affording a limited circumferential movement with respect to and co-acting with said drum, a togglelink age interposed between the free ends of said band, a thrust cap mounted on said trunnion and having internal screw lthreads Qifitting the screw threaded portion ofthe trunnion,

an anchor. plate 'seci lredvtothe hub. support 7 and having portions constituting abutments adapted to be engaged by partsof the. brake band, a lever ful'crumed -on said anchor plate and having one end engagingfthefthrust cap and the other end connecteduto said. toggle linkage, and-means for rotating. said" thrust ca V V $6. The combination-of; an axle, arsubstantially vertical. trunnion. carried .by said axle and having -ascrewthreadedj portion, a

hub support swive'led on said trunnion, a wheel journaled on said. hub support-to rotate about a substantially horizontal axle, a brakejdrumim'oving with. saidwheel, a brake band co-ac'ting with .saididrurn, a

toggle linkage interposed betWeen-theffree ends of I said band, a thrust oapi mounted on said trunnion and having rinternal screw threads fitting'the screwrthreaded portion of the trunnion an anchor, plate secured to the hub support and having portions constitutingabutments adapted to beifengaged by parts of {the brake band a lever fulcru'med .on said anchor plate vand? having one endrengaging said I thrust cap a. link connecting the opposite: end r. of said. lever With said toggle linkage, springmeansfor normally vholdingthe brakeband in; a position such that it engages one of said abutments, and means iorfrota'ting "the said thrust cap.

' 17. The combination-of-an axle a substantially vertical trunnion; carried by'said axle and having a screw "threaded'portion, a hub support swiveld "on said; trunnion, a Wheel 'journalechon "said hub support, a

brake drum moving with said Wheel, a brake band co-acting with said drum, a toggle linkage interposed between the free ends of said band, a thrust cap mounted on said trunnion and having internal screw threads fitting the screw threaded portion of the trunnion, an anchor plate secured to the hub support and having portions constituting abutments adapted to be engaged by parts of the brake band, a lever having one end engaging said thrust cap, a link connecting the opposite end of said lever With said toggle linkage, a spring connecting said link with a part fixed with respect to the'anchor plate, and means for rotating said thrust cap.

18. In a braking mechanism, the combination of a brake drum, a brake band co-acting therewith, and means for actuating said brake band including a rotatable thrust cap, and an operating arm adjustably connected to said thrust cap, said arm having a portion thereof offset With respect to said thrust cap and serrated for engagement with a correspondingly serrated part carried by said thrust cap.

- 19. In a braking mechanism, the combination of a brake drum, a brake band coacting therewith, and means for actuating said brake band including a rotatable thrust cap, a member secured to said cap and pr0- vided with a serrated portion having a slot therein, an operating arm journaled on said thrust cap and provided With a stud extending through said slot, and means for clamping said operating arm to said member.

In testimony whereof, We afiix our signatures.

EARL J. W. RAGSDALE. GUSTAVE A. HAEDERER. 

